About Gps Positioning; About The Error; Positioning Using An External Gps Device - Yaesu FTM-400DR Operating Manual

Positioning refers to the calculation of one's own position from the satellites orbit information and
the transmission time of the radio waves. Positioning requires that three or more satellites be
acquired. When positioning cannot be carried out properly, move to an open space as far away
from buildings as possible and where there are fewer obstructions.
Depending on the surrounding environment of the receiver location, an error of several hundred
meters may occur. Although positioning is possible using only three satellites, depending on the
positioning conditions, the positioning accuracy may become worse, or may no longer be possible
under the following conditions:
• Between high rise buildings, narrow roads between buildings, indoors and under the shade of
buildings, below high voltage lines and underneath overhead structures, between trees and
shrubs such as in forests and woods, inside tunnels and underground, when used behind a solar-
energy reflecting glass, locations where a strong magnetic field occurs
When using the GPS function for the first time after purchasing the FTM-400DR transceiver, and
when turning it on after It has not been used for a long period time, positioning may take several
minutes in order to search for the satellites. Also, when using the device again several hours after
switching off the power, positioning may take several minutes in order to search for the satellites.
Commercial GPS receive devices can also be connected to the [EXT GPS] jack on the
side of the controller.
The [EXT GPS] plug connector is illustrated below.
➀
➁
➂
84
➀ ➂
➁
GND